This is a great camera and brings Canon's top of the range Pro line a bit closer to amateurs. In fact, it's good enough for professional use and I know of several pros using the 5d (in addition to myself). There are 3 main advantages to the 5d:

Image quality - comparable to even to the top of the line 1dsMKII, the image quality of of the 5d is beautiful and pro level.

Large LCD Screen - the screen is much larger than on previous cameras, including the 1dsMKII. It's very 'photographic' and is even suitable to show clients right after the shot. While it's not that bright, it's quite nice and usable.

Form Factor - it has a smaller form factor than the higher pro cameras and is not very heavy. This is a plus in my book. Even if you are a pro, you don't want to necessarily look like one all the time. If you do want to look like one, you can add the optional battery grip.

I would recommend this camera to anyone. I can think of zero complaints for the pro or advanced amateur photographer.
Amount Paid (US$): 3299